Beam replacement jig and beam replacement method using the same

Abstract

To provide a beam replacing jig and a beam replacing method that enable beam members to be easily replaced indoors without creating an opening in a roof of a steel-framed building.SOLUTION: A beam replacing jig 1 for replacing beam members using hanging means 10 inside a steel-framed building comprises a top plate 2, a vertical member 3, a horizontal member 4, and a bottom plate 5. The top plate has means for connecting to the beam member, the vertical member is fixed perpendicularly to the top plate and the bottom plate, and the horizontal member is fixed perpendicularly to the bottom plate and has means for engaging with the hanging means.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a beam replacement jig for replacing beam members in a ceiling portion of a steel-framed building, and a beam replacement method using the same. [Background technology]

[0002] BACKGROUND ART Conventionally, beam members made of H-shaped steel or the like that are transported to a construction site by truck or the like are generally hoisted up by a crane or the like with wire ropes attached to both ends of the beam members (see, for example, Patent Document 1).

[0003] However, in the method of lifting and replacing a beam member inside a steel-framed building with a crane, there are cases where the top of the crane is higher than the roof when the beam member 6 is lifted to the designated installation position, as shown in Figure 7. In such cases, an opening must be made in the roof to allow the top of the crane to pass through, which increases the number of work steps. In addition, the opening in the roof exposes the work site to rainfall during rainy weather, forcing the replacement work to be suspended, resulting in an extension of the construction period. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 7-11654 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, in the past, when replacing beam members in the ceiling of a steel-framed building, it was sometimes difficult to perform the replacement work unless an opening was made in the roof. The present invention overcomes this difficulty and aims to provide a beam replacement jig and a beam replacement method using the same that allow beam members to be easily replaced indoors without making an opening in the roof of a steel-framed building. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to achieve the above object, and have come up with the idea that by attaching a dedicated jig to the bottom of a beam and lifting this jig with a lifting means, it is possible to easily replace a beam indoors without creating an opening in the roof, and have thus completed the present invention. [1] A beam replacement jig for replacing beam members using a lifting means inside a steel-framed building, It has a top plate, vertical members, horizontal members and a bottom plate, the top plate has means for connecting to the beam member; The upright members are fixed perpendicularly to the top plate and the bottom plate, The cross member is fixed perpendicularly to the bottom plate and has means for engaging with the hanging means. A beam replacement jig characterized by: [2] The beam replacement jig described in [1], characterized in that the means for connecting the top plate to the beam member consists of a plurality of bolt holes, and the means for engaging with the hanging means of the cross member consists of a pair of hanging device locking holes on the left and right. [3] The beam replacement jig described in [1] or [2], characterized in that the vertical member has a vertical member height that ensures a lifting allowance. [4] A beam replacement method for replacing a beam member in a steel-framed building using the beam replacement jig according to any one of [1] to [3], A beam replacement method characterized by placing one beam replacement jig at each end of the beam member, fixing the beam replacement jig to the bottom surface of the beam member, engaging it with the hanging means, and raising and lowering the beam member using the hanging means. [5] A beam replacement method according to [4], characterized in that the suspension means is supported by an existing beam member adjacent to the beam member. [6] In paragraphs [4] or [5] above, The uninstalled beam member is connected to the splice plate and the top plate to be integrated with the beam replacement jig, the hanging means is engaged, the uninstalled beam member is lifted up to a position adjacent to the existing beam member, the splice plate is connected to the existing beam member, the top plate and the splice plate are separated, the beam replacement jig is lowered, and the splice plate is Not yetA beam replacement method comprising an installation step of connecting a beam member to an existing beam member. [7] In paragraphs [4] or [5] above, A beam replacement method characterized by comprising a removal process that engages the beam replacement jig with the lifting means, lifts it up to a position where it will connect with the beam member to be removed, prepares to connect the splice plate of the beam member to be removed with the top plate, connects the splice plate to the top plate, releases the connection between the beam member to be removed and an adjacent beam member, and hangs down the beam member to be removed. [8] In paragraph [7] above, A beam replacement method characterized by comprising an installation step of connecting an uninstalled beam member to the splice plate and the top plate to integrate it with the beam replacement jig, engaging the hanging means, lifting the uninstalled beam member to a position adjacent to the existing beam member, connecting the splice plate to the existing beam member, separating the top plate and the splice plate, lowering the beam replacement jig, and connecting the splice plate to the uninstalled beam member. [Effects of the Invention]

[0007] According to the present invention, beam members can be easily replaced inside a steel-framed building without creating an opening in the roof, thereby reducing the number of work steps and shortening the construction period. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a three-dimensional view showing an example of a beam replacement jig according to the present invention. [Figure 2] 1 is a schematic diagram showing an example of a beam member replacement method according to the present invention. [Figure 3] 1 is a three-dimensional view showing step 1 of the installation process or step 4 of the removal process in the beam replacement method according to the present invention. [Figure 4] 10 is a three-dimensional view showing step 2 of the installation process or step 3 of the removal process in the beam replacement method according to the present invention. [Figure 5] 10 is a three-dimensional view showing step 3 of the installation process or step 2 of the removal process in the beam replacement method according to the present invention. [Figure 6]10 is a three-dimensional view showing step 4 of the installation step or step 1 of the removal step in the beam replacement method according to the present invention. [Figure 7] FIG. 1 is a schematic diagram showing an example of a conventional beam member replacement method. [Figure 8] FIG. 1 is a schematic diagram showing the structure of a chain block. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention is an invention for replacing beam members inside a steel-framed building. [Steel construction] Steel-frame construction is a building that uses steel frames for the beams, columns, etc. Steel-frame construction is widely used in factories and warehouses, and is also used in relatively large residential buildings such as condominiums, apartments, and buildings.

[0010] [Beam] Beam members are components that make up beams installed on the ceiling inside an building, and are also called "main beams" or "minor beams."

[0011] [Replacing beams] Replacing a beam member means either or both of installing an uninstalled beam member at a predetermined installation location and removing an existing beam member from a predetermined installation location. Beam members are removed from installation locations that already have existing beam members. The timing of removal is determined based on the degree of deterioration of the existing beam members due to damage, corrosion, etc. On the other hand, beam members are not only installed at installation locations after the existing beam members have been removed, but also in some cases where new beam members are installed at new installation locations where there are no beam members to be removed.

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] [Beam replacement jig] An example of a beam replacement jig of the present invention (hereinafter also referred to as the "jig of the present invention") is shown in Figure 1. As shown in the figure, the jig of the present invention 1 is a jig that can be lifted and lowered by a lifting means such as a chain block 10, and comprises a top plate 2, vertical members 3, horizontal members 4, and a bottom plate 5, and it is preferable that each of these members is joined by welding. The lifting means is a means that can raise and lower the jig of the present invention 1 while it is suspended, and examples thereof include a hoist and a winch. The chain block 10 is one type of hoist. Below, an example in which the chain block 10 is used as the lifting means will be described. The jig 1 of the present invention is used as a lifting tool, and is preferably made of steel in order to ensure strength.

[0014] [Chain block] As shown in Figure 8, a chain block 10 generally has a structure in which, from top to bottom, it is equipped with an upper hook 20, a pulley unit 21, a chain 22, and a lower hook 23 when suspended. To use the chain block, the upper hook 20 is supported directly or indirectly by a fixed material such as a steel frame inside a building, the lower hook 23 is directly or indirectly engaged with a suspended load, and the chain 22 is manually operated to raise or lower the suspended load. For simplicity, in figures other than Figure 8 (for example, Figure 1), the entire chain block 10 is represented by a single line, and the support means that supports the upper hook of the chain block 10 is represented by a single fulcrum as shown in Figure 1, which is called the upper hook fulcrum 30.

[0015] [Tabletop] The top plate 2 preferably has multiple bolt holes 8 as a means for connecting to the underside of the beam member 6, preferably via splice plates 7. The installed beam member 6 is generally made up of multiple beam members rigidly joined together, with this rigid joining being achieved by fastening multiple beam members 6 connected in the longitudinal direction together at multiple locations via splice plates 7. Therefore, providing multiple bolt holes 8 of the same type as the splice plates 7 in the top plate 2 is preferable, as the bolts for rigid joining can also be used to connect the jig 1 of the present invention to the beam member 6 via the splice plates 7. In the example of FIG. 1 , the beam member 6 has three bolt holes 8 on each side on the underside of each end, so the top plate 2 also has three bolt holes 8 on each side. The splice plates may be omitted.

[0016] [Vertical timber] The uprights 3 are fixed perpendicularly to the top plate 2 and the bottom plate 5. The role of the uprights 3 is to position the fulcrum (hereinafter also referred to as the "lifting fulcrum") when lifting the beam member at a certain height distance Δh lower than the bottom end of the beam member. This reduces the vertical movement distance by Δh when lifting the top end of the beam member to the same height position, making lifting easier. The Δh is also called the "lifting allowance." To ensure the lifting allowance (i.e., Δh≧0), the height of the vertical member 3 (vertical member height) is preferably set to be vertical member height≧Δh-(thickness of splice plate+thickness of top plate).

[0017] [Horizontal material] The cross member 4 is fixed vertically to the bottom plate 5 and is preferably provided with a pair of hoisting gear locking holes 9 on the left and right as means for engaging with a chain block 10. The top of the hoisting gear locking holes 9 serves as a fulcrum for hanging the beam member 6. Providing a pair of left and right hoisting attachment holes 9 makes it easy to lift while maintaining horizontality in the left-right direction (width direction of the beam member). The chain block 10 can be engaged with the hoisting attachment hole 9 either by directly engaging the lower hook or by engaging the lower hook via a connecting fitting (not shown) such as a shackle. The pair of hoisting tool locking holes 9 are positioned relative to the top plate 2 so that the chain block 10 engaged therewith does not interfere with the top plate 2.

[0018] [Bottom plate] The bottom plate 5 serves to prevent the beam replacement jig 1, which is placed upright on the work floor, from tipping over.

[0019] [Beam replacement method] Next, an embodiment of the beam replacement method according to the present invention (hereinafter also referred to as the "method of the present invention") will be described. Note that the following description will be given taking as an example a case where the top plate 2 has bolt holes 8 and the cross member 4 has a pair of left and right suspension tool locking holes 9 (see FIG. 1).

[0020] The method of the present invention is a beam replacement method for replacing a beam member 6 in the ceiling of a steel-framed building using a beam replacement jig 1, as shown in Fig. 2, for example. In the method of the present invention, first, one beam replacement jig 1 is placed at each end of the beam member 6. As a result, the beam member 6 is supported and suspended at both ends in the longitudinal direction, making it easy to maintain the beam member 6 horizontally in the longitudinal direction.

[0021] Next, the beam replacement jig 1 is fixed to the bottom surface of the beam member 6 via the splice plate 7 . Next, the beam member 6 is engaged with the chain block 10, and the beam member 6 is raised and lowered by the chain block 10. Thus, the method of the present invention allows replacement of beam members without creating openings in the roof.

[0022] [Number of chain blocks used] One or two chain blocks 10 can be used per beam replacement jig 1. When using one chain block, two connecting hoists (such as wire ropes with hooks, not shown) are engaged with the left and right hoisting tool locking holes 9, one each, and both are engaged with the lower hooks 23 of one chain block 10. When using two chain blocks, one connecting hoist (such as wire ropes with hooks, not shown) is engaged with the left and right hoisting tool locking holes 9, one each, and the other is engaged with the lower hook 23 of the other chain block 10. Using two chain blocks is preferable because it is easier to align the lifting heights on the left and right sides than when using one chain block.

[0023] [Chain block support material] As the fixing material for supporting the chain block 10, i.e., the fixing material for engaging the upper hook fulcrum 30, it is preferable to use the existing beam member 13 adjacent to the beam member 6, from the viewpoint of the workability of the preparatory work of attaching a locking device (not shown) to the fixing material (see Figure 2).

[0024] When two chain blocks 10 are used per beam replacement jig 1, it is preferable to select the locking positions of the upper hook fulcrums 30 on both sides of the upper end face of the existing beam member 13 in the width direction as the locking positions of the upper hook fulcrums 30 (see Figure 1). This reduces the vertical movement distance of the beam member 6.

[0025] When one chain block 10 is used per beam replacement jig 1, the engagement position of the upper hook fulcrum 30 can be the central position in the width direction on the lower end surface side of the existing beam member 13.

[0026] [Installation process] A preferred embodiment of the step (installation step) of installing beam member 6 in the method of the present invention will be described with reference to FIGS. (Step 1) The uninstalled beam member 6 is connected (temporarily fastened with bolts) to the splice plate 7 and the top plate to integrate it with the beam replacement jig 1, and the chain block 10 is engaged with the hoisting tool engaging hole 9 (Figure 3). (Step 2) The uninstalled beam member 6 is lifted to a position adjacent to the existing beam member 13, and the splice plate 7 is bolted to the existing beam member 13 (FIG. 4). (Step 3) Separate the top plate 2 and the splice plate 7, and hang down the beam replacement jig 1 (Figure 5). (Step 4) The splice plate 7 is bolted to the uninstalled beam member 6 (Fig. 5). This completes the rigid connection between the adjacent beam members.

[0027] [Removal process] A preferred embodiment of the step of removing beam member 6 (removal step) in the method of the present invention will be described with reference to FIGS. (Step 1) The beam replacement jig 1 is engaged with the chain block 10 and lifted up to a position where it can be connected to the beam member 6 to be removed (Fig. 6). (Step 2) Prepare to join the splice plate 7 of the beam member 6 to be removed to the top plate 2 (FIG. 5). That is, align the bolt holes of the splice plate 7 and the top plate 2. (Step 3) Join the splice plate 7 and the top plate 2 (Fig. 4). This joining can be done temporarily. (Step 4) The connection between the splice plate 7 and the adjacent beam member 13 is released, and the beam member 6 to be removed is hung down (FIG. 3).

[0028] Using the splice plate 7 in the above installation and removal processes is advantageous in that it makes it easier to align the existing beam member 13 with the uninstalled or to-be-removed beam member 6 and securely fix the beam members, and furthermore the splice plate 7 itself can be used to join the beam members together. However, it is also possible to carry out the installation and removal processes without using the splice plate 7, for example, by directly joining the beam member 6 and the top plate 2. [Example]

[0029] In a steel-framed factory building, an H-shaped steel beam (H-250 x 125 x 6 x 9 mm, cross-sectional area: 37 cm 2 Twenty-four beam members (100mm x 100mm, length: 7.5m, weight: 0.22 ton) were replaced. For this replacement work, the beam members to be removed had already been removed, so when installing the new beam members, installation work was carried out according to steps 1 to 4 of the installation process of the method of the present invention. Plate thicknesses of the beam replacement jig 1 used were 5.5 to 9.0 mm, and each member was fixed by welding. The height from the underside of the bottom plate to the underside of the top plate was 400 mm. As a result, the work period was reduced by 33% compared to the conventional method (when the same number of beams were installed in the configuration of Figure 7). [Explanation of symbols]

[0030] 1. Jig of the present invention (beam replacement jig of the present invention) 2. Top plate 3 Vertical timber 4 Crosspiece 5 Bottom plate 6 Beam members (to be installed or removed) 7 Connection plate 8 bolt holes 9. Lifting fixture hole 10 Chain block (hanging means) 13 Adjacent existing beam members 20 Upper hook 21 Pulley section 22 Chain 23 Lower Hook 30 Upper hook fulcrum

Claims

1. A beam replacement jig for replacing a beam member by a lifting means inside a steel-framed building, It has a top plate, vertical members, horizontal members and a bottom plate, the top plate has means for connecting to the beam member; The upright members are fixed perpendicularly to the top plate and the bottom plate, The cross member is fixed perpendicularly to the bottom plate and has means for engaging with the hanging means. A beam replacement jig characterized by:

2. The means for connecting the top plate to the beam member comprises a plurality of bolt holes, and the means for engaging the horizontal member with the hanging means comprises a pair of left and right hanging tool locking holes. Alternatively, the means for connecting the top plate to the beam member comprises a plurality of bolt holes, the means for engaging the horizontal member with the hanging means comprises a pair of left and right hanging tool locking holes, and the vertical member has a vertical member height that ensures a lifting allowance. The beam replacement jig according to claim 1 .

3. A beam replacement method for replacing a beam member in a steel-framed building using the beam replacement jig according to claim 1 or 2, The beam replacement jig is disposed at each end of the beam member, and the beam replacement jig is fixed to the bottom surface of the beam member and engaged with the hanging means, and the beam member is raised and lowered by the hanging means. Alternatively, one beam replacement jig is placed at each end of the beam member, the beam replacement jig is fixed to the bottom surface of the beam member, and engaged with the hanging means. The beam member is raised and lowered by the hanging means, and the hanging means is supported by an existing beam member adjacent to the beam member. A beam replacement method characterized by:

4. A beam replacement method as described in claim 3, characterized in that it includes an installation process of connecting an uninstalled beam member to a splice plate and the top plate to integrate it with the beam replacement jig, engaging the hanging means, lifting the uninstalled beam member to a position adjacent to the existing beam member, connecting the splice plate to the existing beam member, separating the top plate and the splice plate, lowering the beam replacement jig, and connecting the splice plate to the uninstalled beam member.

5. The beam replacement method described in claim 3, characterized in that it includes a removal process in which the beam replacement jig is engaged with the lifting means, lifted up to a position where it will be connected to the beam member to be removed, prepared to connect the splice plate of the beam member to be removed to the top plate, connected the splice plate to the top plate, released the connection between the beam member to be removed and an adjacent beam member, and hung down the beam member to be removed.

6. A beam replacement method as described in claim 5, characterized in that it includes an installation process of connecting an uninstalled beam member to the splice plate and the top plate to integrate it with the beam replacement jig, engaging the hanging means, lifting the uninstalled beam member to a position adjacent to the existing beam member, connecting the splice plate to the existing beam member, separating the top plate and the splice plate, lowering the beam replacement jig, and connecting the splice plate to the uninstalled beam member.

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